一道英语改错题！！！请问它们错在哪里，需要详细的过程

1、We are convinced of his willingness and ability to do anything. 只有改成ability，才与his有联系，of后面是名词短语。to表目的 2、He stood in the rain,cold and wet. cold与wet是平行结构，都应该是同样的形式，形容词 3、Walk into the school,and you will see the teaching building. 不知道你们学过没有，祈使句的句型是 动